public static string GetMagicWord(PNMType ptype, PNMEncoding encoding)
{
if (ptype == PNMType.PGM && encoding == PNMEncoding.ASCIIEncoding)
{
return("P2");
}
if (ptype == PNMType.PGM && encoding == PNMEncoding.BinaryEncoding)
{
return("P5");
}
if (ptype == PNMType.PPM && encoding == PNMEncoding.ASCIIEncoding)
{
return("P3");
}
if (ptype == PNMType.PPM && encoding == PNMEncoding.BinaryEncoding)
{
return("P6");
}
if (ptype == PNMType.PBM && encoding == PNMEncoding.ASCIIEncoding)
{
return("P1");
}
if (ptype == PNMType.PBM && encoding == PNMEncoding.BinaryEncoding)
{
throw new Exception("PBM files are only written in ASCII encoding.");
}
return("P5");
}
public static string GetMaxPixel(PNMType ptype)
{
switch (ptype)
{
case PNMType.PBM: return("-1"); // dun put in header
}
return("255");
}
public static IPNMWriter GetIPNMWriter(PNMType ptype)
{
IPNMWriter imWriter = null;
switch (ptype)
{
case PNMType.PBM:
imWriter = new PBMWriter();
break;
case PNMType.PGM:
imWriter = new PGMWriter();
break;
case PNMType.PPM:
imWriter = new PPMWriter();
break;
}
return(imWriter);
}
public static void WritePNM(string FilePath, System.Drawing.Image im, PNMEncoding encoding, PNMType ptype)
{
FileStream fs = new FileStream(FilePath, FileMode.Create, FileAccess.Write, FileShare.None);
IPNMDataWriter dw = PNMFactory.GetIPNMDataWriter(fs, encoding);
if (dw == null)
{
throw new Exception
("Currently only Binary and ASCII encoding is supported");
}
try
{
//write image header
dw.WriteLine(PNMFactory.GetMagicWord(ptype, encoding));
dw.WriteLine(im.Width.ToString() + " " + im.Height.ToString());
if (ptype != PNMType.PBM)
{
dw.WriteLine("255");
}
IPNMWriter imWriter = PNMFactory.GetIPNMWriter(ptype);
imWriter.WriteImageData(dw, im);
}
catch { throw; }
}
